<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="echart.min.js"></script>
</head>
<style>
    .a {
        width: 400px;
        height: 400px;
        background-color: #ddd;
    }
</style>

<body>
    <div class="a"></div>
    <script>
        var echa = echarts.init(document.querySelector('.a'));
        var option = {
            xAxis: {
                type: 'category',
                data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
            },
            yAxis: {
                type: 'value'
            },
            series: [{
                data: [820, 932, 901, 934, 1290, 1330, 1320],
                type: 'line',
                smooth: true
            }]
        };
        echa.setOption(option);
    </script>
</body>

</html>